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ArduinoWebsocketServer/Base64.cpp at master · ejeklint/ArduinoWebsocketServer · GitHub
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#
include
"
Base64.h
"
const
char
b64_alphabet[] =
"
ABCDEFGHIJKLMNOPQRSTUVWXYZ
"
"
abcdefghijklmnopqrstuvwxyz
"
"
0123456789+/
"
;
/*
'Private' declarations
*/
inline
void
a3_to_a4
(
unsigned
char
* a4,
unsigned
char
* a3);
inline
void
a4_to_a3
(
unsigned
char
* a3,
unsigned
char
* a4);
inline
unsigned
char
b64_lookup
(
char
c);
int
base64_encode
(
char
*output,
char
*input,
int
inputLen) {
int
i =
0
, j =
0
;
int
encLen =
0
;
unsigned
char
a3[
3
];
unsigned
char
a4[
4
];
while
(inputLen--) {
a3[i++] = *(input++);
if
(i ==
3
) {
a3_to_a4
(a4, a3);
for
(i =
0
; i <
4
; i++) {
output[encLen++] = b64_alphabet[a4[i]];
}
i =
0
;
}
}
if
(i) {
for
(j = i; j <
3
; j++) {
a3[j] =
'
\0
'
;
}
a3_to_a4
(a4, a3);
for
(j =
0
; j < i +
1
; j++) {
output[encLen++] = b64_alphabet[a4[j]];
}
while
((i++ <
3
)) {
output[encLen++] =
'
=
'
;
}
}
output[encLen] =
'
\0
'
;
return
encLen;
}
int
base64_decode
(
char
* output,
char
* input,
int
inputLen) {
int
i =
0
, j =
0
;
int
decLen =
0
;
unsigned
char
a3[
3
];
unsigned
char
a4[
4
];
while
(inputLen--) {
if
(*input ==
'
=
'
) {
break
;
}
a4[i++] = *(input++);
if
(i ==
4
) {
for
(i =
0
; i <
4
; i++) {
a4[i] =
b64_lookup
(a4[i]);
}
a4_to_a3
(a3,a4);
for
(i =
0
; i <
3
; i++) {
output[decLen++] = a3[i];
}
i =
0
;
}
}
if
(i) {
for
(j = i; j <
4
; j++) {
a4[j] =
'
\0
'
;
}
for
(j =
0
; j <
4
; j++) {
a4[j] =
b64_lookup
(a4[j]);
}
a4_to_a3
(a3,a4);
for
(j =
0
; j < i -
1
; j++) {
output[decLen++] = a3[j];
}
}
output[decLen] =
'
\0
'
;
return
decLen;
}
int
base64_enc_len
(
int
plainLen) {
int
n = plainLen;
return
(n +
2
- ((n +
2
) %
3
)) /
3
*
4
;
}
int
base64_dec_len
(
char
* input,
int
inputLen) {
int
i =
0
;
int
numEq =
0
;
for
(i = inputLen -
1
; input[i] ==
'
=
'
; i--) {
numEq++;
}
return
((
6
* inputLen) /
8
) - numEq;
}
inline
void
a3_to_a4
(
unsigned
char
* a4,
unsigned
char
* a3) {
a4[
0
] = (a3[
0
] &
0xfc
) >>
2
;
a4[
1
] = ((a3[
0
] &
0x03
) <<
4
) + ((a3[
1
] &
0xf0
) >>
4
);
a4[
2
] = ((a3[
1
] &
0x0f
) <<
2
) + ((a3[
2
] &
0xc0
) >>
6
);
a4[
3
] = (a3[
2
] &
0x3f
);
}
inline
void
a4_to_a3
(
unsigned
char
* a3,
unsigned
char
* a4) {
a3[
0
] = (a4[
0
] <<
2
) + ((a4[
1
] &
0x30
) >>
4
);
a3[
1
] = ((a4[
1
] &
0xf
) <<
4
) + ((a4[
2
] &
0x3c
) >>
2
);
a3[
2
] = ((a4[
2
] &
0x3
) <<
6
) + a4[
3
];
}
inline
unsigned
char
b64_lookup
(
char
c) {
int
i;
for
(i =
0
; i <
64
; i++) {
if
(b64_alphabet[i] == c) {
return
i;
}
}
return
-
1
;
}
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